Implement error reporting in monaco for painless language (#84695) (#85283)

2025-04-23 17:28:26 -04:00 · 2020-12-08 13:03:10 -05:00 · 2020-12-08 13:03:10 -05:00 · 5667e60343
commit 5667e60343
parent 3d23351f74
28 changed files with 9075 additions and 16 deletions
--- a/.eslintignore
+++ b/.eslintignore
@ -44,3 +44,4 @@ snapshots.js
 /packages/kbn-ui-framework/doc_site/build
 /packages/kbn-ui-framework/generator-kui/*/templates/
 /packages/kbn-ui-shared-deps/flot_charts
+/packages/kbn-monaco/src/painless/antlr
--- a/package.json
+++ b/package.json
@ -151,6 +151,7 @@
    "angular-resource": "1.8.0",
    "angular-sanitize": "^1.8.0",
    "angular-ui-ace": "0.2.3",
+    "antlr4ts": "^0.5.0-alpha.3",
    "apollo-cache-inmemory": "1.6.2",
    "apollo-client": "^2.3.8",
    "apollo-link-http": "^1.5.16",
@ -574,6 +575,7 @@
    "angular-recursion": "^1.0.5",
    "angular-route": "^1.8.0",
    "angular-sortable-view": "^0.0.17",
+    "antlr4ts-cli": "^0.5.0-alpha.3",
    "apidoc": "^0.25.0",
    "apidoc-markdown": "^5.1.8",
    "apollo-link": "^1.2.3",
--- a/packages/kbn-monaco/package.json
+++ b/packages/kbn-monaco/package.json
@ -6,7 +6,8 @@
  "license": "Apache-2.0",
  "scripts": {
    "build": "node ./scripts/build.js",
-    "kbn:bootstrap": "yarn build --dev"
+    "kbn:bootstrap": "yarn build --dev",
+    "build:antlr4ts": "../../node_modules/antlr4ts-cli/antlr4ts ./src/painless/antlr/painless_lexer.g4 ./src/painless/antlr/painless_parser.g4 && node ./scripts/fix_generated_antlr.js"
  },
  "devDependencies": {
    "@kbn/babel-preset": "link:../kbn-babel-preset",
@ -15,4 +16,4 @@
  "dependencies": {
    "@kbn/i18n": "link:../kbn-i18n"
  }
-}
+}
--- a/packages/kbn-monaco/scripts/fix_generated_antlr.js
+++ b/packages/kbn-monaco/scripts/fix_generated_antlr.js
@ -0,0 +1,66 @@
+/*
+ * Licensed to Elasticsearch B.V. under one or more contributor
+ * license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright
+ * ownership. Elasticsearch B.V. licenses this file to you under
+ * the Apache License, Version 2.0 (the "License"); you may
+ * not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+const { join } = require('path');
+const { readdirSync, readFileSync, writeFileSync, renameSync } = require('fs');
+const ora = require('ora');
+
+const generatedAntlrFolder = join(__dirname, '..', 'src', 'painless', 'antlr');
+
+const generatedAntlrFolderContents = readdirSync(generatedAntlrFolder);
+
+const log = ora('Updating generated antlr grammar').start();
+
+// The generated TS produces some TS linting errors
+// This script adds a //@ts-nocheck comment at the top of each generated file
+// so that the errors can be ignored for now
+generatedAntlrFolderContents
+  .filter((file) => {
+    const fileExtension = file.split('.')[1];
+    return fileExtension.includes('ts');
+  })
+  .forEach((file) => {
+    try {
+      const fileContentRows = readFileSync(join(generatedAntlrFolder, file), 'utf8')
+        .toString()
+        .split('\n');
+
+      fileContentRows.unshift('// @ts-nocheck');
+
+      const filePath = join(generatedAntlrFolder, file);
+      const fileContent = fileContentRows.join('\n');
+
+      writeFileSync(filePath, fileContent, { encoding: 'utf8' });
+    } catch (err) {
+      return log.fail(err.message);
+    }
+  });
+
+// Rename generated parserListener file to snakecase to satisfy file casing check
+// There doesn't appear to be a way to fix this OOTB with antlr4ts-cli
+try {
+  renameSync(
+    join(generatedAntlrFolder, 'painless_parserListener.ts'),
+    join(generatedAntlrFolder, 'painless_parser_listener.ts')
+  );
+} catch (err) {
+  log.warn(`Unable to rename parserListener file to snakecase: ${err.message}`);
+}
+
+log.succeed('Updated generated antlr grammar successfully');
--- a/packages/kbn-monaco/src/painless/README.md
+++ b/packages/kbn-monaco/src/painless/README.md
@ -8,7 +8,7 @@ This folder contains the language definitions for Painless used by the Monaco ed

 Initializes the worker proxy service when the Painless language is first needed. It also exports the [suggestion provider](https://microsoft.github.io/monaco-editor/api/interfaces/monaco.languages.completionitemprovider.html) needed for autocompletion.

-### ./services
+### ./lib
 This directory exports two services:

 1. Worker proxy: Responsible for holding a reference to the Monaco-provided proxy getter.
@ -32,12 +32,15 @@ Contains the Monarch-specific language tokenization rules for Painless.

 ### ./worker

-The worker proxy and worker instantiation code used in both the main thread and the worker thread. The logic for providing autocomplete suggestions resides here.
+The worker proxy and worker instantiation code used in both the main thread and the worker thread. The logic for providing autocomplete suggestions and error reporting resides here.

 ### ./autocomplete_definitions

 This directory is generated by a script and should not be changed manually. Read [Updating autocomplete definitions](#updating-autocomplete-definitions) for more information.

+### ./antlr
+This directory contains the Painless lexer and grammar rules, as well as the generated Typescript code. Read [Compiling ANTLR](#compiling-ANTLR) for more information.
+
 ## Example usage

 ```
@ -102,4 +105,20 @@ node scripts/generate_autocomplete --branch <branch_name>
  - `score`
  - `string_script_field_script_field`

-To add additional contexts, edit the `supportedContexts` constant in `kbn-monaco/scripts/constants.js`.
+To add additional contexts, edit the `supportedContexts` constant in `kbn-monaco/scripts/constants.js`.
+
+## Compiling ANTLR
+
+[ANTLR](https://www.antlr.org/) generates lexical and syntax errors out of the box, which we can use to set error markers in monaco. 
+
+Elasticsearch has defined [lexer and parser grammar](https://github.com/elastic/elasticsearch/tree/master/modules/lang-painless/src/main/antlr) for the Painless language. For now, these rules have been largely copied from ES to Kibana and reside in the `antlr` directory with the `.g4` file extension. We then use [antlr4ts](https://github.com/tunnelvisionlabs/antlr4ts) to generate a lexer and a parser in Typescript.
+
+To regenerate the lexer and parser, run the following script:
+
+```
+npm run build:antlr4ts
+```
+
+*Note:* This script should only need to be run if a change has been made to `painless_lexer.g4` or `painless_parser.g4`.
+
+*Note:* There is a manual change made to the `sempred()` method in the generated `painless_lexer.ts`. This needs further investigation, but it appears there is an offset between the rule index and the token value. Without this manual change, ANTLR incorrectly reports an error when using a `/` or regex in a script. There is a comment in the generated code to this effect.
--- a/packages/kbn-monaco/src/painless/antlr/painless_lexer.g4
+++ b/packages/kbn-monaco/src/painless/antlr/painless_lexer.g4
@ -0,0 +1,122 @@
+/*
+ * Licensed to Elasticsearch B.V. under one or more contributor
+ * license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright
+ * ownership. Elasticsearch B.V. licenses this file to you under
+ * the Apache License, Version 2.0 (the "License"); you may
+ * not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+lexer grammar painless_lexer;
+
+WS: [ \t\n\r]+ -> skip;
+COMMENT: ( '//' .*? [\n\r] | '/*' .*? '*/' ) -> skip;
+
+LBRACK:    '{';
+RBRACK:    '}';
+LBRACE:    '[';
+RBRACE:    ']';
+LP:        '(';
+RP:        ')';
+// We switch modes after a dot to ensure there are not conflicts
+// between shortcuts and decimal values.  Without the mode switch
+// shortcuts such as id.0.0 will fail because 0.0 will be interpreted
+// as a decimal value instead of two individual list-style shortcuts.
+DOT:       '.'  -> mode(AFTER_DOT);
+NSDOT:     '?.' -> mode(AFTER_DOT);
+COMMA:     ',';
+SEMICOLON: ';';
+IF:        'if';
+IN:        'in';
+ELSE:      'else';
+WHILE:     'while';
+DO:        'do';
+FOR:       'for';
+CONTINUE:  'continue';
+BREAK:     'break';
+RETURN:    'return';
+NEW:       'new';
+TRY:       'try';
+CATCH:     'catch';
+THROW:     'throw';
+THIS:      'this';
+INSTANCEOF: 'instanceof';
+
+BOOLNOT: '!';
+BWNOT:   '~';
+MUL:     '*';
+DIV:     '/' { this.isSlashRegex() == false }?;
+REM:     '%';
+ADD:     '+';
+SUB:     '-';
+LSH:     '<<';
+RSH:     '>>';
+USH:     '>>>';
+LT:      '<';
+LTE:     '<=';
+GT:      '>';
+GTE:     '>=';
+EQ:      '==';
+EQR:     '===';
+NE:      '!=';
+NER:     '!==';
+BWAND:   '&';
+XOR:     '^';
+BWOR:    '|';
+BOOLAND: '&&';
+BOOLOR:  '||';
+COND:    '?';
+COLON:   ':';
+ELVIS:   '?:';
+REF:     '::';
+ARROW:   '->';
+FIND:    '=~';
+MATCH:   '==~';
+INCR:    '++';
+DECR:    '--';
+
+ASSIGN: '=';
+AADD:   '+=';
+ASUB:   '-=';
+AMUL:   '*=';
+ADIV:   '/=';
+AREM:   '%=';
+AAND:   '&=';
+AXOR:   '^=';
+AOR:    '|=';
+ALSH:   '<<=';
+ARSH:   '>>=';
+AUSH:   '>>>=';
+
+OCTAL: '0' [0-7]+ [lL]?;
+HEX: '0' [xX] [0-9a-fA-F]+ [lL]?;
+INTEGER: ( '0' | [1-9] [0-9]* ) [lLfFdD]?;
+DECIMAL: ( '0' | [1-9] [0-9]* ) (DOT [0-9]+)? ( [eE] [+\-]? [0-9]+ )? [fFdD]?;
+
+STRING: ( '"' ( '\\"' | '\\\\' | ~[\\"] )*? '"' ) | ( '\'' ( '\\\'' | '\\\\' | ~[\\'] )*? '\'' );
+REGEX: '/' ( '\\' ~'\n' | ~('/' | '\n') )+? '/' [cilmsUux]* { this.isSlashRegex() }?;
+
+TRUE:  'true';
+FALSE: 'false';
+
+NULL: 'null';
+
+PRIMITIVE: 'boolean' | 'byte' | 'short' | 'char' | 'int' | 'long' | 'float' | 'double';
+DEF: 'def';
+
+ID: [_a-zA-Z] [_a-zA-Z0-9]*;
+
+mode AFTER_DOT;
+
+DOTINTEGER: ( '0' | [1-9] [0-9]* ) -> mode(DEFAULT_MODE);
+DOTID: [_a-zA-Z] [_a-zA-Z0-9]*     -> mode(DEFAULT_MODE);
--- a/packages/kbn-monaco/src/painless/antlr/painless_lexer.interp
+++ b/packages/kbn-monaco/src/painless/antlr/painless_lexer.interp
--- a/packages/kbn-monaco/src/painless/antlr/painless_lexer.tokens
+++ b/packages/kbn-monaco/src/painless/antlr/painless_lexer.tokens
@ -0,0 +1,158 @@
+WS=1
+COMMENT=2
+LBRACK=3
+RBRACK=4
+LBRACE=5
+RBRACE=6
+LP=7
+RP=8
+DOT=9
+NSDOT=10
+COMMA=11
+SEMICOLON=12
+IF=13
+IN=14
+ELSE=15
+WHILE=16
+DO=17
+FOR=18
+CONTINUE=19
+BREAK=20
+RETURN=21
+NEW=22
+TRY=23
+CATCH=24
+THROW=25
+THIS=26
+INSTANCEOF=27
+BOOLNOT=28
+BWNOT=29
+MUL=30
+DIV=31
+REM=32
+ADD=33
+SUB=34
+LSH=35
+RSH=36
+USH=37
+LT=38
+LTE=39
+GT=40
+GTE=41
+EQ=42
+EQR=43
+NE=44
+NER=45
+BWAND=46
+XOR=47
+BWOR=48
+BOOLAND=49
+BOOLOR=50
+COND=51
+COLON=52
+ELVIS=53
+REF=54
+ARROW=55
+FIND=56
+MATCH=57
+INCR=58
+DECR=59
+ASSIGN=60
+AADD=61
+ASUB=62
+AMUL=63
+ADIV=64
+AREM=65
+AAND=66
+AXOR=67
+AOR=68
+ALSH=69
+ARSH=70
+AUSH=71
+OCTAL=72
+HEX=73
+INTEGER=74
+DECIMAL=75
+STRING=76
+REGEX=77
+TRUE=78
+FALSE=79
+NULL=80
+PRIMITIVE=81
+DEF=82
+ID=83
+DOTINTEGER=84
+DOTID=85
+'{'=3
+'}'=4
+'['=5
+']'=6
+'('=7
+')'=8
+'.'=9
+'?.'=10
+','=11
+';'=12
+'if'=13
+'in'=14
+'else'=15
+'while'=16
+'do'=17
+'for'=18
+'continue'=19
+'break'=20
+'return'=21
+'new'=22
+'try'=23
+'catch'=24
+'throw'=25
+'this'=26
+'instanceof'=27
+'!'=28
+'~'=29
+'*'=30
+'/'=31
+'%'=32
+'+'=33
+'-'=34
+'<<'=35
+'>>'=36
+'>>>'=37
+'<'=38
+'<='=39
+'>'=40
+'>='=41
+'=='=42
+'==='=43
+'!='=44
+'!=='=45
+'&'=46
+'^'=47
+'|'=48
+'&&'=49
+'||'=50
+'?'=51
+':'=52
+'?:'=53
+'::'=54
+'->'=55
+'=~'=56
+'==~'=57
+'++'=58
+'--'=59
+'='=60
+'+='=61
+'-='=62
+'*='=63
+'/='=64
+'%='=65
+'&='=66
+'^='=67
+'|='=68
+'<<='=69
+'>>='=70
+'>>>='=71
+'true'=78
+'false'=79
+'null'=80
+'def'=82
--- a/packages/kbn-monaco/src/painless/antlr/painless_lexer.ts
+++ b/packages/kbn-monaco/src/painless/antlr/painless_lexer.ts
@ -0,0 +1,538 @@
+// @ts-nocheck
+// Generated from ./src/painless/antlr/painless_lexer.g4 by ANTLR 4.7.3-SNAPSHOT
+
+
+import { ATN } from "antlr4ts/atn/ATN";
+import { ATNDeserializer } from "antlr4ts/atn/ATNDeserializer";
+import { CharStream } from "antlr4ts/CharStream";
+import { Lexer } from "antlr4ts/Lexer";
+import { LexerATNSimulator } from "antlr4ts/atn/LexerATNSimulator";
+import { NotNull } from "antlr4ts/Decorators";
+import { Override } from "antlr4ts/Decorators";
+import { RuleContext } from "antlr4ts/RuleContext";
+import { Vocabulary } from "antlr4ts/Vocabulary";
+import { VocabularyImpl } from "antlr4ts/VocabularyImpl";
+
+import * as Utils from "antlr4ts/misc/Utils";
+
+
+export class painless_lexer extends Lexer {
+	public static readonly WS = 1;
+	public static readonly COMMENT = 2;
+	public static readonly LBRACK = 3;
+	public static readonly RBRACK = 4;
+	public static readonly LBRACE = 5;
+	public static readonly RBRACE = 6;
+	public static readonly LP = 7;
+	public static readonly RP = 8;
+	public static readonly DOT = 9;
+	public static readonly NSDOT = 10;
+	public static readonly COMMA = 11;
+	public static readonly SEMICOLON = 12;
+	public static readonly IF = 13;
+	public static readonly IN = 14;
+	public static readonly ELSE = 15;
+	public static readonly WHILE = 16;
+	public static readonly DO = 17;
+	public static readonly FOR = 18;
+	public static readonly CONTINUE = 19;
+	public static readonly BREAK = 20;
+	public static readonly RETURN = 21;
+	public static readonly NEW = 22;
+	public static readonly TRY = 23;
+	public static readonly CATCH = 24;
+	public static readonly THROW = 25;
+	public static readonly THIS = 26;
+	public static readonly INSTANCEOF = 27;
+	public static readonly BOOLNOT = 28;
+	public static readonly BWNOT = 29;
+	public static readonly MUL = 30;
+	public static readonly DIV = 31;
+	public static readonly REM = 32;
+	public static readonly ADD = 33;
+	public static readonly SUB = 34;
+	public static readonly LSH = 35;
+	public static readonly RSH = 36;
+	public static readonly USH = 37;
+	public static readonly LT = 38;
+	public static readonly LTE = 39;
+	public static readonly GT = 40;
+	public static readonly GTE = 41;
+	public static readonly EQ = 42;
+	public static readonly EQR = 43;
+	public static readonly NE = 44;
+	public static readonly NER = 45;
+	public static readonly BWAND = 46;
+	public static readonly XOR = 47;
+	public static readonly BWOR = 48;
+	public static readonly BOOLAND = 49;
+	public static readonly BOOLOR = 50;
+	public static readonly COND = 51;
+	public static readonly COLON = 52;
+	public static readonly ELVIS = 53;
+	public static readonly REF = 54;
+	public static readonly ARROW = 55;
+	public static readonly FIND = 56;
+	public static readonly MATCH = 57;
+	public static readonly INCR = 58;
+	public static readonly DECR = 59;
+	public static readonly ASSIGN = 60;
+	public static readonly AADD = 61;
+	public static readonly ASUB = 62;
+	public static readonly AMUL = 63;
+	public static readonly ADIV = 64;
+	public static readonly AREM = 65;
+	public static readonly AAND = 66;
+	public static readonly AXOR = 67;
+	public static readonly AOR = 68;
+	public static readonly ALSH = 69;
+	public static readonly ARSH = 70;
+	public static readonly AUSH = 71;
+	public static readonly OCTAL = 72;
+	public static readonly HEX = 73;
+	public static readonly INTEGER = 74;
+	public static readonly DECIMAL = 75;
+	public static readonly STRING = 76;
+	public static readonly REGEX = 77;
+	public static readonly TRUE = 78;
+	public static readonly FALSE = 79;
+	public static readonly NULL = 80;
+	public static readonly PRIMITIVE = 81;
+	public static readonly DEF = 82;
+	public static readonly ID = 83;
+	public static readonly DOTINTEGER = 84;
+	public static readonly DOTID = 85;
+	public static readonly AFTER_DOT = 1;
+
+	// tslint:disable:no-trailing-whitespace
+	public static readonly channelNames: string[] = [
+		"DEFAULT_TOKEN_CHANNEL", "HIDDEN",
+	];
+
+	// tslint:disable:no-trailing-whitespace
+	public static readonly modeNames: string[] = [
+		"DEFAULT_MODE", "AFTER_DOT",
+	];
+
+	public static readonly ruleNames: string[] = [
+		"WS", "COMMENT", "LBRACK", "RBRACK", "LBRACE", "RBRACE", "LP", "RP", "DOT",
+		"NSDOT", "COMMA", "SEMICOLON", "IF", "IN", "ELSE", "WHILE", "DO", "FOR",
+		"CONTINUE", "BREAK", "RETURN", "NEW", "TRY", "CATCH", "THROW", "THIS",
+		"INSTANCEOF", "BOOLNOT", "BWNOT", "MUL", "DIV", "REM", "ADD", "SUB", "LSH",
+		"RSH", "USH", "LT", "LTE", "GT", "GTE", "EQ", "EQR", "NE", "NER", "BWAND",
+		"XOR", "BWOR", "BOOLAND", "BOOLOR", "COND", "COLON", "ELVIS", "REF", "ARROW",
+		"FIND", "MATCH", "INCR", "DECR", "ASSIGN", "AADD", "ASUB", "AMUL", "ADIV",
+		"AREM", "AAND", "AXOR", "AOR", "ALSH", "ARSH", "AUSH", "OCTAL", "HEX",
+		"INTEGER", "DECIMAL", "STRING", "REGEX", "TRUE", "FALSE", "NULL", "PRIMITIVE",
+		"DEF", "ID", "DOTINTEGER", "DOTID",
+	];
+
+	private static readonly _LITERAL_NAMES: Array<string | undefined> = [
+		undefined, undefined, undefined, "'{'", "'}'", "'['", "']'", "'('", "')'",
+		"'.'", "'?.'", "','", "';'", "'if'", "'in'", "'else'", "'while'", "'do'",
+		"'for'", "'continue'", "'break'", "'return'", "'new'", "'try'", "'catch'",
+		"'throw'", "'this'", "'instanceof'", "'!'", "'~'", "'*'", "'/'", "'%'",
+		"'+'", "'-'", "'<<'", "'>>'", "'>>>'", "'<'", "'<='", "'>'", "'>='", "'=='",
+		"'==='", "'!='", "'!=='", "'&'", "'^'", "'|'", "'&&'", "'||'", "'?'",
+		"':'", "'?:'", "'::'", "'->'", "'=~'", "'==~'", "'++'", "'--'", "'='",
+		"'+='", "'-='", "'*='", "'/='", "'%='", "'&='", "'^='", "'|='", "'<<='",
+		"'>>='", "'>>>='", undefined, undefined, undefined, undefined, undefined,
+		undefined, "'true'", "'false'", "'null'", undefined, "'def'",
+	];
+	private static readonly _SYMBOLIC_NAMES: Array<string | undefined> = [
+		undefined, "WS", "COMMENT", "LBRACK", "RBRACK", "LBRACE", "RBRACE", "LP",
+		"RP", "DOT", "NSDOT", "COMMA", "SEMICOLON", "IF", "IN", "ELSE", "WHILE",
+		"DO", "FOR", "CONTINUE", "BREAK", "RETURN", "NEW", "TRY", "CATCH", "THROW",
+		"THIS", "INSTANCEOF", "BOOLNOT", "BWNOT", "MUL", "DIV", "REM", "ADD",
+		"SUB", "LSH", "RSH", "USH", "LT", "LTE", "GT", "GTE", "EQ", "EQR", "NE",
+		"NER", "BWAND", "XOR", "BWOR", "BOOLAND", "BOOLOR", "COND", "COLON", "ELVIS",
+		"REF", "ARROW", "FIND", "MATCH", "INCR", "DECR", "ASSIGN", "AADD", "ASUB",
+		"AMUL", "ADIV", "AREM", "AAND", "AXOR", "AOR", "ALSH", "ARSH", "AUSH",
+		"OCTAL", "HEX", "INTEGER", "DECIMAL", "STRING", "REGEX", "TRUE", "FALSE",
+		"NULL", "PRIMITIVE", "DEF", "ID", "DOTINTEGER", "DOTID",
+	];
+	public static readonly VOCABULARY: Vocabulary = new VocabularyImpl(painless_lexer._LITERAL_NAMES, painless_lexer._SYMBOLIC_NAMES, []);
+
+	// @Override
+	// @NotNull
+	public get vocabulary(): Vocabulary {
+		return painless_lexer.VOCABULARY;
+	}
+	// tslint:enable:no-trailing-whitespace
+
+
+	constructor(input: CharStream) {
+		super(input);
+		this._interp = new LexerATNSimulator(painless_lexer._ATN, this);
+	}
+
+	// @Override
+	public get grammarFileName(): string { return "painless_lexer.g4"; }
+
+	// @Override
+	public get ruleNames(): string[] { return painless_lexer.ruleNames; }
+
+	// @Override
+	public get serializedATN(): string { return painless_lexer._serializedATN; }
+
+	// @Override
+	public get channelNames(): string[] { return painless_lexer.channelNames; }
+
+	// @Override
+	public get modeNames(): string[] { return painless_lexer.modeNames; }
+
+	// @Override
+	public sempred(_localctx: RuleContext, ruleIndex: number, predIndex: number): boolean {
+		switch (ruleIndex) {
+    // DO NOT CHANGE
+    // This is a manual fix to handle slashes appropriately
+		case 31:
+			return this.DIV_sempred(_localctx, predIndex);
+
+    // DO NOT CHANGE
+    // This is a manual fix to handle regexes appropriately
+		case 77:
+			return this.REGEX_sempred(_localctx, predIndex);
+		}
+		return true;
+	}
+	private DIV_sempred(_localctx: RuleContext, predIndex: number): boolean {
+		switch (predIndex) {
+		case 0:
+			return  this.isSlashRegex() == false ;
+		}
+		return true;
+	}
+	private REGEX_sempred(_localctx: RuleContext, predIndex: number): boolean {
+		switch (predIndex) {
+		case 1:
+			return  this.isSlashRegex() ;
+		}
+		return true;
+	}
+
+	private static readonly _serializedATNSegments: number = 2;
+	private static readonly _serializedATNSegment0: string =
+		"\x03\uC91D\uCABA\u058D\uAFBA\u4F53\u0607\uEA8B\uC241\x02W\u027A\b\x01" +
+		"\b\x01\x04\x02\t\x02\x04\x03\t\x03\x04\x04\t\x04\x04\x05\t\x05\x04\x06" +
+		"\t\x06\x04\x07\t\x07\x04\b\t\b\x04\t\t\t\x04\n\t\n\x04\v\t\v\x04\f\t\f" +
+		"\x04\r\t\r\x04\x0E\t\x0E\x04\x0F\t\x0F\x04\x10\t\x10\x04\x11\t\x11\x04" +
+		"\x12\t\x12\x04\x13\t\x13\x04\x14\t\x14\x04\x15\t\x15\x04\x16\t\x16\x04" +
+		"\x17\t\x17\x04\x18\t\x18\x04\x19\t\x19\x04\x1A\t\x1A\x04\x1B\t\x1B\x04" +
+		"\x1C\t\x1C\x04\x1D\t\x1D\x04\x1E\t\x1E\x04\x1F\t\x1F\x04 \t \x04!\t!\x04" +
+		"\"\t\"\x04#\t#\x04$\t$\x04%\t%\x04&\t&\x04\'\t\'\x04(\t(\x04)\t)\x04*" +
+		"\t*\x04+\t+\x04,\t,\x04-\t-\x04.\t.\x04/\t/\x040\t0\x041\t1\x042\t2\x04" +
+		"3\t3\x044\t4\x045\t5\x046\t6\x047\t7\x048\t8\x049\t9\x04:\t:\x04;\t;\x04" +
+		"<\t<\x04=\t=\x04>\t>\x04?\t?\x04@\t@\x04A\tA\x04B\tB\x04C\tC\x04D\tD\x04" +
+		"E\tE\x04F\tF\x04G\tG\x04H\tH\x04I\tI\x04J\tJ\x04K\tK\x04L\tL\x04M\tM\x04" +
+		"N\tN\x04O\tO\x04P\tP\x04Q\tQ\x04R\tR\x04S\tS\x04T\tT\x04U\tU\x04V\tV\x03" +
+		"\x02\x06\x02\xB0\n\x02\r\x02\x0E\x02\xB1\x03\x02\x03\x02\x03\x03\x03\x03" +
+		"\x03\x03\x03\x03\x07\x03\xBA\n\x03\f\x03\x0E\x03\xBD\v\x03\x03\x03\x03" +
+		"\x03\x03\x03\x03\x03\x03\x03\x07\x03\xC4\n\x03\f\x03\x0E\x03\xC7\v\x03" +
+		"\x03\x03\x03\x03\x05\x03\xCB\n\x03\x03\x03\x03\x03\x03\x04\x03\x04\x03" +
+		"\x05\x03\x05\x03\x06\x03\x06\x03\x07\x03\x07\x03\b\x03\b\x03\t\x03\t\x03" +
+		"\n\x03\n\x03\n\x03\n\x03\v\x03\v\x03\v\x03\v\x03\v\x03\f\x03\f\x03\r\x03" +
+		"\r\x03\x0E\x03\x0E\x03\x0E\x03\x0F\x03\x0F\x03\x0F\x03\x10\x03\x10\x03" +
+		"\x10\x03\x10\x03\x10\x03\x11\x03\x11\x03\x11\x03\x11\x03\x11\x03\x11\x03" +
+		"\x12\x03\x12\x03\x12\x03\x13\x03\x13\x03\x13\x03\x13\x03\x14\x03\x14\x03" +
+		"\x14\x03\x14\x03\x14\x03\x14\x03\x14\x03\x14\x03\x14\x03\x15\x03\x15\x03" +
+		"\x15\x03\x15\x03\x15\x03\x15\x03\x16\x03\x16\x03\x16\x03\x16\x03\x16\x03" +
+		"\x16\x03\x16\x03\x17\x03\x17\x03\x17\x03\x17\x03\x18\x03\x18\x03\x18\x03" +
+		"\x18\x03\x19\x03\x19\x03\x19\x03\x19\x03\x19\x03\x19\x03\x1A\x03\x1A\x03" +
+		"\x1A\x03\x1A\x03\x1A\x03\x1A\x03\x1B\x03\x1B\x03\x1B\x03\x1B\x03\x1B\x03" +
+		"\x1C\x03\x1C\x03\x1C\x03\x1C\x03\x1C\x03\x1C\x03\x1C\x03\x1C\x03\x1C\x03" +
+		"\x1C\x03\x1C\x03\x1D\x03\x1D\x03\x1E\x03\x1E\x03\x1F\x03\x1F\x03 \x03" +
+		" \x03 \x03!\x03!\x03\"\x03\"\x03#\x03#\x03$\x03$\x03$\x03%\x03%\x03%\x03" +
+		"&\x03&\x03&\x03&\x03\'\x03\'\x03(\x03(\x03(\x03)\x03)\x03*\x03*\x03*\x03" +
+		"+\x03+\x03+\x03,\x03,\x03,\x03,\x03-\x03-\x03-\x03.\x03.\x03.\x03.\x03" +
+		"/\x03/\x030\x030\x031\x031\x032\x032\x032\x033\x033\x033\x034\x034\x03" +
+		"5\x035\x036\x036\x036\x037\x037\x037\x038\x038\x038\x039\x039\x039\x03" +
+		":\x03:\x03:\x03:\x03;\x03;\x03;\x03<\x03<\x03<\x03=\x03=\x03>\x03>\x03" +
+		">\x03?\x03?\x03?\x03@\x03@\x03@\x03A\x03A\x03A\x03B\x03B\x03B\x03C\x03" +
+		"C\x03C\x03D\x03D\x03D\x03E\x03E\x03E\x03F\x03F\x03F\x03F\x03G\x03G\x03" +
+		"G\x03G\x03H\x03H\x03H\x03H\x03H\x03I\x03I\x06I\u01BA\nI\rI\x0EI\u01BB" +
+		"\x03I\x05I\u01BF\nI\x03J\x03J\x03J\x06J\u01C4\nJ\rJ\x0EJ\u01C5\x03J\x05" +
+		"J\u01C9\nJ\x03K\x03K\x03K\x07K\u01CE\nK\fK\x0EK\u01D1\vK\x05K\u01D3\n" +
+		"K\x03K\x05K\u01D6\nK\x03L\x03L\x03L\x07L\u01DB\nL\fL\x0EL\u01DE\vL\x05" +
+		"L\u01E0\nL\x03L\x03L\x06L\u01E4\nL\rL\x0EL\u01E5\x05L\u01E8\nL\x03L\x03" +
+		"L\x05L\u01EC\nL\x03L\x06L\u01EF\nL\rL\x0EL\u01F0\x05L\u01F3\nL\x03L\x05" +
+		"L\u01F6\nL\x03M\x03M\x03M\x03M\x03M\x03M\x07M\u01FE\nM\fM\x0EM\u0201\v" +
+		"M\x03M\x03M\x03M\x03M\x03M\x03M\x03M\x07M\u020A\nM\fM\x0EM\u020D\vM\x03" +
+		"M\x05M\u0210\nM\x03N\x03N\x03N\x03N\x06N\u0216\nN\rN\x0EN\u0217\x03N\x03" +
+		"N\x07N\u021C\nN\fN\x0EN\u021F\vN\x03N\x03N\x03O\x03O\x03O\x03O\x03O\x03" +
+		"P\x03P\x03P\x03P\x03P\x03P\x03Q\x03Q\x03Q\x03Q\x03Q\x03R\x03R\x03R\x03" +
+		"R\x03R\x03R\x03R\x03R\x03R\x03R\x03R\x03R\x03R\x03R\x03R\x03R\x03R\x03" +
+		"R\x03R\x03R\x03R\x03R\x03R\x03R\x03R\x03R\x03R\x03R\x03R\x03R\x03R\x03" +
+		"R\x03R\x03R\x03R\x03R\x03R\x03R\x05R\u0259\nR\x03S\x03S\x03S\x03S\x03" +
+		"T\x03T\x07T\u0261\nT\fT\x0ET\u0264\vT\x03U\x03U\x03U\x07U\u0269\nU\fU" +
+		"\x0EU\u026C\vU\x05U\u026E\nU\x03U\x03U\x03V\x03V\x07V\u0274\nV\fV\x0E" +
+		"V\u0277\vV\x03V\x03V\x07\xBB\xC5\u01FF\u020B\u0217\x02\x02W\x04\x02\x03" +
+		"\x06\x02\x04\b\x02\x05\n\x02\x06\f\x02\x07\x0E\x02\b\x10\x02\t\x12\x02" +
+		"\n\x14\x02\v\x16\x02\f\x18\x02\r\x1A\x02\x0E\x1C\x02\x0F\x1E\x02\x10 " +
+		"\x02\x11\"\x02\x12$\x02\x13&\x02\x14(\x02\x15*\x02\x16,\x02\x17.\x02\x18" +
+		"0\x02\x192\x02\x1A4\x02\x1B6\x02\x1C8\x02\x1D:\x02\x1E<\x02\x1F>\x02 " +
+		"@\x02!B\x02\"D\x02#F\x02$H\x02%J\x02&L\x02\'N\x02(P\x02)R\x02*T\x02+V" +
+		"\x02,X\x02-Z\x02.\\\x02/^\x020`\x021b\x022d\x023f\x024h\x025j\x026l\x02" +
+		"7n\x028p\x029r\x02:t\x02;v\x02<x\x02=z\x02>|\x02?~\x02@\x80\x02A\x82\x02" +
+		"B\x84\x02C\x86\x02D\x88\x02E\x8A\x02F\x8C\x02G\x8E\x02H\x90\x02I\x92\x02" +
+		"J\x94\x02K\x96\x02L\x98\x02M\x9A\x02N\x9C\x02O\x9E\x02P\xA0\x02Q\xA2\x02" +
+		"R\xA4\x02S\xA6\x02T\xA8\x02U\xAA\x02V\xAC\x02W\x04\x02\x03\x15\x05\x02" +
+		"\v\f\x0F\x0F\"\"\x04\x02\f\f\x0F\x0F\x03\x0229\x04\x02NNnn\x04\x02ZZz" +
+		"z\x05\x022;CHch\x03\x023;\x03\x022;\b\x02FFHHNNffhhnn\x04\x02GGgg\x04" +
+		"\x02--//\x06\x02FFHHffhh\x04\x02$$^^\x04\x02))^^\x03\x02\f\f\x04\x02\f" +
+		"\f11\t\x02WWeekknouuwwzz\x05\x02C\\aac|\x06\x022;C\\aac|\x02\u02A0\x02" +
+		"\x04\x03\x02\x02\x02\x02\x06\x03\x02\x02\x02\x02\b\x03\x02\x02\x02\x02" +
+		"\n\x03\x02\x02\x02\x02\f\x03\x02\x02\x02\x02\x0E\x03\x02\x02\x02\x02\x10" +
+		"\x03\x02\x02\x02\x02\x12\x03\x02\x02\x02\x02\x14\x03\x02\x02\x02\x02\x16" +
+		"\x03\x02\x02\x02\x02\x18\x03\x02\x02\x02\x02\x1A\x03\x02\x02\x02\x02\x1C" +
+		"\x03\x02\x02\x02\x02\x1E\x03\x02\x02\x02\x02 \x03\x02\x02\x02\x02\"\x03" +
+		"\x02\x02\x02\x02$\x03\x02\x02\x02\x02&\x03\x02\x02\x02\x02(\x03\x02\x02" +
+		"\x02\x02*\x03\x02\x02\x02\x02,\x03\x02\x02\x02\x02.\x03\x02\x02\x02\x02" +
+		"0\x03\x02\x02\x02\x022\x03\x02\x02\x02\x024\x03\x02\x02\x02\x026\x03\x02" +
+		"\x02\x02\x028\x03\x02\x02\x02\x02:\x03\x02\x02\x02\x02<\x03\x02\x02\x02" +
+		"\x02>\x03\x02\x02\x02\x02@\x03\x02\x02\x02\x02B\x03\x02\x02\x02\x02D\x03" +
+		"\x02\x02\x02\x02F\x03\x02\x02\x02\x02H\x03\x02\x02\x02\x02J\x03\x02\x02" +
+		"\x02\x02L\x03\x02\x02\x02\x02N\x03\x02\x02\x02\x02P\x03\x02\x02\x02\x02" +
+		"R\x03\x02\x02\x02\x02T\x03\x02\x02\x02\x02V\x03\x02\x02\x02\x02X\x03\x02" +
+		"\x02\x02\x02Z\x03\x02\x02\x02\x02\\\x03\x02\x02\x02\x02^\x03\x02\x02\x02" +
+		"\x02`\x03\x02\x02\x02\x02b\x03\x02\x02\x02\x02d\x03\x02\x02\x02\x02f\x03" +
+		"\x02\x02\x02\x02h\x03\x02\x02\x02\x02j\x03\x02\x02\x02\x02l\x03\x02\x02" +
+		"\x02\x02n\x03\x02\x02\x02\x02p\x03\x02\x02\x02\x02r\x03\x02\x02\x02\x02" +
+		"t\x03\x02\x02\x02\x02v\x03\x02\x02\x02\x02x\x03\x02\x02\x02\x02z\x03\x02" +
+		"\x02\x02\x02|\x03\x02\x02\x02\x02~\x03\x02\x02\x02\x02\x80\x03\x02\x02" +
+		"\x02\x02\x82\x03\x02\x02\x02\x02\x84\x03\x02\x02\x02\x02\x86\x03\x02\x02" +
+		"\x02\x02\x88\x03\x02\x02\x02\x02\x8A\x03\x02\x02\x02\x02\x8C\x03\x02\x02" +
+		"\x02\x02\x8E\x03\x02\x02\x02\x02\x90\x03\x02\x02\x02\x02\x92\x03\x02\x02" +
+		"\x02\x02\x94\x03\x02\x02\x02\x02\x96\x03\x02\x02\x02\x02\x98\x03\x02\x02" +
+		"\x02\x02\x9A\x03\x02\x02\x02\x02\x9C\x03\x02\x02\x02\x02\x9E\x03\x02\x02" +
+		"\x02\x02\xA0\x03\x02\x02\x02\x02\xA2\x03\x02\x02\x02\x02\xA4\x03\x02\x02" +
+		"\x02\x02\xA6\x03\x02\x02\x02\x02\xA8\x03\x02\x02\x02\x03\xAA\x03\x02\x02" +
+		"\x02\x03\xAC\x03\x02\x02\x02\x04\xAF\x03\x02\x02\x02\x06\xCA\x03\x02\x02" +
+		"\x02\b\xCE\x03\x02\x02\x02\n\xD0\x03\x02\x02\x02\f\xD2\x03\x02\x02\x02" +
+		"\x0E\xD4\x03\x02\x02\x02\x10\xD6\x03\x02\x02\x02\x12\xD8\x03\x02\x02\x02" +
+		"\x14\xDA\x03\x02\x02\x02\x16\xDE\x03\x02\x02\x02\x18\xE3\x03\x02\x02\x02" +
+		"\x1A\xE5\x03\x02\x02\x02\x1C\xE7\x03\x02\x02\x02\x1E\xEA\x03\x02\x02\x02" +
+		" \xED\x03\x02\x02\x02\"\xF2\x03\x02\x02\x02$\xF8\x03\x02\x02\x02&\xFB" +
+		"\x03\x02\x02\x02(\xFF\x03\x02\x02\x02*\u0108\x03\x02\x02\x02,\u010E\x03" +
+		"\x02\x02\x02.\u0115\x03\x02\x02\x020\u0119\x03\x02\x02\x022\u011D\x03" +
+		"\x02\x02\x024\u0123\x03\x02\x02\x026\u0129\x03\x02\x02\x028\u012E\x03" +
+		"\x02\x02\x02:\u0139\x03\x02\x02\x02<\u013B\x03\x02\x02\x02>\u013D\x03" +
+		"\x02\x02\x02@\u013F\x03\x02\x02\x02B\u0142\x03\x02\x02\x02D\u0144\x03" +
+		"\x02\x02\x02F\u0146\x03\x02\x02\x02H\u0148\x03\x02\x02\x02J\u014B\x03" +
+		"\x02\x02\x02L\u014E\x03\x02\x02\x02N\u0152\x03\x02\x02\x02P\u0154\x03" +
+		"\x02\x02\x02R\u0157\x03\x02\x02\x02T\u0159\x03\x02\x02\x02V\u015C\x03" +
+		"\x02\x02\x02X\u015F\x03\x02\x02\x02Z\u0163\x03\x02\x02\x02\\\u0166\x03" +
+		"\x02\x02\x02^\u016A\x03\x02\x02\x02`\u016C\x03\x02\x02\x02b\u016E\x03" +
+		"\x02\x02\x02d\u0170\x03\x02\x02\x02f\u0173\x03\x02\x02\x02h\u0176\x03" +
+		"\x02\x02\x02j\u0178\x03\x02\x02\x02l\u017A\x03\x02\x02\x02n\u017D\x03" +
+		"\x02\x02\x02p\u0180\x03\x02\x02\x02r\u0183\x03\x02\x02\x02t\u0186\x03" +
+		"\x02\x02\x02v\u018A\x03\x02\x02\x02x\u018D\x03\x02\x02\x02z\u0190\x03" +
+		"\x02\x02\x02|\u0192\x03\x02\x02\x02~\u0195\x03\x02\x02\x02\x80\u0198\x03" +
+		"\x02\x02\x02\x82\u019B\x03\x02\x02\x02\x84\u019E\x03\x02\x02\x02\x86\u01A1" +
+		"\x03\x02\x02\x02\x88\u01A4\x03\x02\x02\x02\x8A\u01A7\x03\x02\x02\x02\x8C" +
+		"\u01AA\x03\x02\x02\x02\x8E\u01AE\x03\x02\x02\x02\x90\u01B2\x03\x02\x02" +
+		"\x02\x92\u01B7\x03\x02\x02\x02\x94\u01C0\x03\x02\x02\x02\x96\u01D2\x03" +
+		"\x02\x02\x02\x98\u01DF\x03\x02\x02\x02\x9A\u020F\x03\x02\x02\x02\x9C\u0211" +
+		"\x03\x02\x02\x02\x9E\u0222\x03\x02\x02\x02\xA0\u0227\x03\x02\x02\x02\xA2" +
+		"\u022D\x03\x02\x02\x02\xA4\u0258\x03\x02\x02\x02\xA6\u025A\x03\x02\x02" +
+		"\x02\xA8\u025E\x03\x02\x02\x02\xAA\u026D\x03\x02\x02\x02\xAC\u0271\x03" +
+		"\x02\x02\x02\xAE\xB0\t\x02\x02\x02\xAF\xAE\x03\x02\x02\x02\xB0\xB1\x03" +
+		"\x02\x02\x02\xB1\xAF\x03\x02\x02\x02\xB1\xB2\x03\x02\x02\x02\xB2\xB3\x03" +
+		"\x02\x02\x02\xB3\xB4\b\x02\x02\x02\xB4\x05\x03\x02\x02\x02\xB5\xB6\x07" +
+		"1\x02\x02\xB6\xB7\x071\x02\x02\xB7\xBB\x03\x02\x02\x02\xB8\xBA\v\x02\x02" +
+		"\x02\xB9\xB8\x03\x02\x02\x02\xBA\xBD\x03\x02\x02\x02\xBB\xBC\x03\x02\x02" +
+		"\x02\xBB\xB9\x03\x02\x02\x02\xBC\xBE\x03\x02\x02\x02\xBD\xBB\x03\x02\x02" +
+		"\x02\xBE\xCB\t\x03\x02\x02\xBF\xC0\x071\x02\x02\xC0\xC1\x07,\x02\x02\xC1" +
+		"\xC5\x03\x02\x02\x02\xC2\xC4\v\x02\x02\x02\xC3\xC2\x03\x02\x02\x02\xC4" +
+		"\xC7\x03\x02\x02\x02\xC5\xC6\x03\x02\x02\x02\xC5\xC3\x03\x02\x02\x02\xC6" +
+		"\xC8\x03\x02\x02\x02\xC7\xC5\x03\x02\x02\x02\xC8\xC9\x07,\x02\x02\xC9" +
+		"\xCB\x071\x02\x02\xCA\xB5\x03\x02\x02\x02\xCA\xBF\x03\x02\x02\x02\xCB" +
+		"\xCC\x03\x02\x02\x02\xCC\xCD\b\x03\x02\x02\xCD\x07\x03\x02\x02\x02\xCE" +
+		"\xCF\x07}\x02\x02\xCF\t\x03\x02\x02\x02\xD0\xD1\x07\x7F\x02\x02\xD1\v" +
+		"\x03\x02\x02\x02\xD2\xD3\x07]\x02\x02\xD3\r\x03\x02\x02\x02\xD4\xD5\x07" +
+		"_\x02\x02\xD5\x0F\x03\x02\x02\x02\xD6\xD7\x07*\x02\x02\xD7\x11\x03\x02" +
+		"\x02\x02\xD8\xD9\x07+\x02\x02\xD9\x13\x03\x02\x02\x02\xDA\xDB\x070\x02" +
+		"\x02\xDB\xDC\x03\x02\x02\x02\xDC\xDD\b\n\x03\x02\xDD\x15\x03\x02\x02\x02" +
+		"\xDE\xDF\x07A\x02\x02\xDF\xE0\x070\x02\x02\xE0\xE1\x03\x02\x02\x02\xE1" +
+		"\xE2\b\v\x03\x02\xE2\x17\x03\x02\x02\x02\xE3\xE4\x07.\x02\x02\xE4\x19" +
+		"\x03\x02\x02\x02\xE5\xE6\x07=\x02\x02\xE6\x1B\x03\x02\x02\x02\xE7\xE8" +
+		"\x07k\x02\x02\xE8\xE9\x07h\x02\x02\xE9\x1D\x03\x02\x02\x02\xEA\xEB\x07" +
+		"k\x02\x02\xEB\xEC\x07p\x02\x02\xEC\x1F\x03\x02\x02\x02\xED\xEE\x07g\x02" +
+		"\x02\xEE\xEF\x07n\x02\x02\xEF\xF0\x07u\x02\x02\xF0\xF1\x07g\x02\x02\xF1" +
+		"!\x03\x02\x02\x02\xF2\xF3\x07y\x02\x02\xF3\xF4\x07j\x02\x02\xF4\xF5\x07" +
+		"k\x02\x02\xF5\xF6\x07n\x02\x02\xF6\xF7\x07g\x02\x02\xF7#\x03\x02\x02\x02" +
+		"\xF8\xF9\x07f\x02\x02\xF9\xFA\x07q\x02\x02\xFA%\x03\x02\x02\x02\xFB\xFC" +
+		"\x07h\x02\x02\xFC\xFD\x07q\x02\x02\xFD\xFE\x07t\x02\x02\xFE\'\x03\x02" +
+		"\x02\x02\xFF\u0100\x07e\x02\x02\u0100\u0101\x07q\x02\x02\u0101\u0102\x07" +
+		"p\x02\x02\u0102\u0103\x07v\x02\x02\u0103\u0104\x07k\x02\x02\u0104\u0105" +
+		"\x07p\x02\x02\u0105\u0106\x07w\x02\x02\u0106\u0107\x07g\x02\x02\u0107" +
+		")\x03\x02\x02\x02\u0108\u0109\x07d\x02\x02\u0109\u010A\x07t\x02\x02\u010A" +
+		"\u010B\x07g\x02\x02\u010B\u010C\x07c\x02\x02\u010C\u010D\x07m\x02\x02" +
+		"\u010D+\x03\x02\x02\x02\u010E\u010F\x07t\x02\x02\u010F\u0110\x07g\x02" +
+		"\x02\u0110\u0111\x07v\x02\x02\u0111\u0112\x07w\x02\x02\u0112\u0113\x07" +
+		"t\x02\x02\u0113\u0114\x07p\x02\x02\u0114-\x03\x02\x02\x02\u0115\u0116" +
+		"\x07p\x02\x02\u0116\u0117\x07g\x02\x02\u0117\u0118\x07y\x02\x02\u0118" +
+		"/\x03\x02\x02\x02\u0119\u011A\x07v\x02\x02\u011A\u011B\x07t\x02\x02\u011B" +
+		"\u011C\x07{\x02\x02\u011C1\x03\x02\x02\x02\u011D\u011E\x07e\x02\x02\u011E" +
+		"\u011F\x07c\x02\x02\u011F\u0120\x07v\x02\x02\u0120\u0121\x07e\x02\x02" +
+		"\u0121\u0122\x07j\x02\x02\u01223\x03\x02\x02\x02\u0123\u0124\x07v\x02" +
+		"\x02\u0124\u0125\x07j\x02\x02\u0125\u0126\x07t\x02\x02\u0126\u0127\x07" +
+		"q\x02\x02\u0127\u0128\x07y\x02\x02\u01285\x03\x02\x02\x02\u0129\u012A" +
+		"\x07v\x02\x02\u012A\u012B\x07j\x02\x02\u012B\u012C\x07k\x02\x02\u012C" +
+		"\u012D\x07u\x02\x02\u012D7\x03\x02\x02\x02\u012E\u012F\x07k\x02\x02\u012F" +
+		"\u0130\x07p\x02\x02\u0130\u0131\x07u\x02\x02\u0131\u0132\x07v\x02\x02" +
+		"\u0132\u0133\x07c\x02\x02\u0133\u0134\x07p\x02\x02\u0134\u0135\x07e\x02" +
+		"\x02\u0135\u0136\x07g\x02\x02\u0136\u0137\x07q\x02\x02\u0137\u0138\x07" +
+		"h\x02\x02\u01389\x03\x02\x02\x02\u0139\u013A\x07#\x02\x02\u013A;\x03\x02" +
+		"\x02\x02\u013B\u013C\x07\x80\x02\x02\u013C=\x03\x02\x02\x02\u013D\u013E" +
+		"\x07,\x02\x02\u013E?\x03\x02\x02\x02\u013F\u0140\x071\x02\x02\u0140\u0141" +
+		"\x06 \x02\x02\u0141A\x03\x02\x02\x02\u0142\u0143\x07\'\x02\x02\u0143C" +
+		"\x03\x02\x02\x02\u0144\u0145\x07-\x02\x02\u0145E\x03\x02\x02\x02\u0146" +
+		"\u0147\x07/\x02\x02\u0147G\x03\x02\x02\x02\u0148\u0149\x07>\x02\x02\u0149" +
+		"\u014A\x07>\x02\x02\u014AI\x03\x02\x02\x02\u014B\u014C\x07@\x02\x02\u014C" +
+		"\u014D\x07@\x02\x02\u014DK\x03\x02\x02\x02\u014E\u014F\x07@\x02\x02\u014F" +
+		"\u0150\x07@\x02\x02\u0150\u0151\x07@\x02\x02\u0151M\x03\x02\x02\x02\u0152" +
+		"\u0153\x07>\x02\x02\u0153O\x03\x02\x02\x02\u0154\u0155\x07>\x02\x02\u0155" +
+		"\u0156\x07?\x02\x02\u0156Q\x03\x02\x02\x02\u0157\u0158\x07@\x02\x02\u0158" +
+		"S\x03\x02\x02\x02\u0159\u015A\x07@\x02\x02\u015A\u015B\x07?\x02\x02\u015B" +
+		"U\x03\x02\x02\x02\u015C\u015D\x07?\x02\x02\u015D\u015E\x07?\x02\x02\u015E" +
+		"W\x03\x02\x02\x02\u015F\u0160\x07?\x02\x02\u0160\u0161\x07?\x02\x02\u0161" +
+		"\u0162\x07?\x02\x02\u0162Y\x03\x02\x02\x02\u0163\u0164\x07#\x02\x02\u0164" +
+		"\u0165\x07?\x02\x02\u0165[\x03\x02\x02\x02\u0166\u0167\x07#\x02\x02\u0167" +
+		"\u0168\x07?\x02\x02\u0168\u0169\x07?\x02\x02\u0169]\x03\x02\x02\x02\u016A" +
+		"\u016B\x07(\x02\x02\u016B_\x03\x02\x02\x02\u016C\u016D\x07`\x02\x02\u016D" +
+		"a\x03\x02\x02\x02\u016E\u016F\x07~\x02\x02\u016Fc\x03\x02\x02\x02\u0170" +
+		"\u0171\x07(\x02\x02\u0171\u0172\x07(\x02\x02\u0172e\x03\x02\x02\x02\u0173" +
+		"\u0174\x07~\x02\x02\u0174\u0175\x07~\x02\x02\u0175g\x03\x02\x02\x02\u0176" +
+		"\u0177\x07A\x02\x02\u0177i\x03\x02\x02\x02\u0178\u0179\x07<\x02\x02\u0179" +
+		"k\x03\x02\x02\x02\u017A\u017B\x07A\x02\x02\u017B\u017C\x07<\x02\x02\u017C" +
+		"m\x03\x02\x02\x02\u017D\u017E\x07<\x02\x02\u017E\u017F\x07<\x02\x02\u017F" +
+		"o\x03\x02\x02\x02\u0180\u0181\x07/\x02\x02\u0181\u0182\x07@\x02\x02\u0182" +
+		"q\x03\x02\x02\x02\u0183\u0184\x07?\x02\x02\u0184\u0185\x07\x80\x02\x02" +
+		"\u0185s\x03\x02\x02\x02\u0186\u0187\x07?\x02\x02\u0187\u0188\x07?\x02" +
+		"\x02\u0188\u0189\x07\x80\x02\x02\u0189u\x03\x02\x02\x02\u018A\u018B\x07" +
+		"-\x02\x02\u018B\u018C\x07-\x02\x02\u018Cw\x03\x02\x02\x02\u018D\u018E" +
+		"\x07/\x02\x02\u018E\u018F\x07/\x02\x02\u018Fy\x03\x02\x02\x02\u0190\u0191" +
+		"\x07?\x02\x02\u0191{\x03\x02\x02\x02\u0192\u0193\x07-\x02\x02\u0193\u0194" +
+		"\x07?\x02\x02\u0194}\x03\x02\x02\x02\u0195\u0196\x07/\x02\x02\u0196\u0197" +
+		"\x07?\x02\x02\u0197\x7F\x03\x02\x02\x02\u0198\u0199\x07,\x02\x02\u0199" +
+		"\u019A\x07?\x02\x02\u019A\x81\x03\x02\x02\x02\u019B\u019C\x071\x02\x02" +
+		"\u019C\u019D\x07?\x02\x02\u019D\x83\x03\x02\x02\x02\u019E\u019F\x07\'" +
+		"\x02\x02\u019F\u01A0\x07?\x02\x02\u01A0\x85\x03\x02\x02\x02\u01A1\u01A2" +
+		"\x07(\x02\x02\u01A2\u01A3\x07?\x02\x02\u01A3\x87\x03\x02\x02\x02\u01A4" +
+		"\u01A5\x07`\x02\x02\u01A5\u01A6\x07?\x02\x02\u01A6\x89\x03\x02\x02\x02" +
+		"\u01A7\u01A8\x07~\x02\x02\u01A8\u01A9\x07?\x02\x02\u01A9\x8B\x03\x02\x02" +
+		"\x02\u01AA\u01AB\x07>\x02\x02\u01AB\u01AC\x07>\x02\x02\u01AC\u01AD\x07" +
+		"?\x02\x02\u01AD\x8D\x03\x02\x02\x02\u01AE\u01AF\x07@\x02\x02\u01AF\u01B0" +
+		"\x07@\x02\x02\u01B0\u01B1\x07?\x02\x02\u01B1\x8F\x03\x02\x02\x02\u01B2" +
+		"\u01B3\x07@\x02\x02\u01B3\u01B4\x07@\x02\x02\u01B4\u01B5\x07@\x02\x02" +
+		"\u01B5\u01B6\x07?\x02\x02\u01B6\x91\x03\x02\x02\x02\u01B7\u01B9\x072\x02" +
+		"\x02\u01B8\u01BA\t\x04\x02\x02\u01B9\u01B8\x03\x02\x02\x02\u01BA\u01BB" +
+		"\x03\x02\x02\x02\u01BB\u01B9\x03\x02\x02\x02\u01BB\u01BC\x03\x02\x02\x02" +
+		"\u01BC\u01BE\x03\x02\x02\x02\u01BD\u01BF\t\x05\x02\x02\u01BE\u01BD\x03" +
+		"\x02\x02\x02\u01BE\u01BF\x03\x02\x02\x02\u01BF\x93\x03\x02\x02\x02\u01C0" +
+		"\u01C1\x072\x02\x02\u01C1\u01C3\t\x06\x02\x02\u01C2\u01C4\t\x07\x02\x02" +
+		"\u01C3\u01C2\x03\x02\x02\x02\u01C4\u01C5\x03\x02\x02\x02\u01C5\u01C3\x03" +
+		"\x02\x02\x02\u01C5\u01C6\x03\x02\x02\x02\u01C6\u01C8\x03\x02\x02\x02\u01C7" +
+		"\u01C9\t\x05\x02\x02\u01C8\u01C7\x03\x02\x02\x02\u01C8\u01C9\x03\x02\x02" +
+		"\x02\u01C9\x95\x03\x02\x02\x02\u01CA\u01D3\x072\x02\x02\u01CB\u01CF\t" +
+		"\b\x02\x02\u01CC\u01CE\t\t\x02\x02\u01CD\u01CC\x03\x02\x02\x02\u01CE\u01D1" +
+		"\x03\x02\x02\x02\u01CF\u01CD\x03\x02\x02\x02\u01CF\u01D0\x03\x02\x02\x02" +
+		"\u01D0\u01D3\x03\x02\x02\x02\u01D1\u01CF\x03\x02\x02\x02\u01D2\u01CA\x03" +
+		"\x02\x02\x02\u01D2\u01CB\x03\x02\x02\x02\u01D3\u01D5\x03\x02\x02\x02\u01D4" +
+		"\u01D6\t\n\x02\x02\u01D5\u01D4\x03\x02\x02\x02\u01D5\u01D6\x03\x02\x02" +
+		"\x02\u01D6\x97\x03\x02\x02\x02\u01D7\u01E0\x072\x02\x02\u01D8\u01DC\t" +
+		"\b\x02\x02\u01D9\u01DB\t\t\x02\x02\u01DA\u01D9\x03\x02\x02\x02\u01DB\u01DE" +
+		"\x03\x02\x02\x02\u01DC\u01DA\x03\x02\x02\x02\u01DC\u01DD\x03\x02\x02\x02" +
+		"\u01DD\u01E0\x03\x02\x02\x02\u01DE\u01DC\x03\x02\x02\x02\u01DF\u01D7\x03" +
+		"\x02\x02\x02\u01DF\u01D8\x03\x02\x02\x02\u01E0\u01E7\x03\x02\x02\x02\u01E1" +
+		"\u01E3\x05\x14\n\x02\u01E2\u01E4\t\t\x02\x02\u01E3\u01E2\x03\x02\x02\x02" +
+		"\u01E4\u01E5\x03\x02\x02\x02\u01E5\u01E3\x03\x02\x02\x02\u01E5\u01E6\x03" +
+		"\x02\x02\x02\u01E6\u01E8\x03\x02\x02\x02\u01E7\u01E1\x03\x02\x02\x02\u01E7" +
+		"\u01E8\x03\x02\x02\x02\u01E8\u01F2\x03\x02\x02\x02\u01E9\u01EB\t\v\x02" +
+		"\x02\u01EA\u01EC\t\f\x02\x02\u01EB\u01EA\x03\x02\x02\x02\u01EB\u01EC\x03" +
+		"\x02\x02\x02\u01EC\u01EE\x03\x02\x02\x02\u01ED\u01EF\t\t\x02\x02\u01EE" +
+		"\u01ED\x03\x02\x02\x02\u01EF\u01F0\x03\x02\x02\x02\u01F0\u01EE\x03\x02" +
+		"\x02\x02\u01F0\u01F1\x03\x02\x02\x02\u01F1\u01F3\x03\x02\x02\x02\u01F2" +
+		"\u01E9\x03\x02\x02\x02\u01F2\u01F3\x03\x02\x02\x02\u01F3\u01F5\x03\x02" +
+		"\x02\x02\u01F4\u01F6\t\r\x02\x02\u01F5\u01F4\x03\x02\x02\x02\u01F5\u01F6" +
+		"\x03\x02\x02\x02\u01F6\x99\x03\x02\x02\x02\u01F7\u01FF\x07$\x02\x02\u01F8" +
+		"\u01F9\x07^\x02\x02\u01F9\u01FE\x07$\x02\x02\u01FA\u01FB\x07^\x02\x02" +
+		"\u01FB\u01FE\x07^\x02\x02\u01FC\u01FE\n\x0E\x02\x02\u01FD\u01F8\x03\x02" +
+		"\x02\x02\u01FD\u01FA\x03\x02\x02\x02\u01FD\u01FC\x03\x02\x02\x02\u01FE" +
+		"\u0201\x03\x02\x02\x02\u01FF\u0200\x03\x02\x02\x02\u01FF\u01FD\x03\x02" +
+		"\x02\x02\u0200\u0202\x03\x02\x02\x02\u0201\u01FF\x03\x02\x02\x02\u0202" +
+		"\u0210\x07$\x02\x02\u0203\u020B\x07)\x02\x02\u0204\u0205\x07^\x02\x02" +
+		"\u0205\u020A\x07)\x02\x02\u0206\u0207\x07^\x02\x02\u0207\u020A\x07^\x02" +
+		"\x02\u0208\u020A\n\x0F\x02\x02\u0209\u0204\x03\x02\x02\x02\u0209\u0206" +
+		"\x03\x02\x02\x02\u0209\u0208\x03\x02\x02\x02\u020A\u020D\x03\x02\x02\x02" +
+		"\u020B\u020C\x03\x02\x02\x02\u020B\u0209\x03\x02\x02\x02\u020C";
+	private static readonly _serializedATNSegment1: string =
+		"\u020E\x03\x02\x02\x02\u020D\u020B\x03\x02\x02\x02\u020E\u0210\x07)\x02" +
+		"\x02\u020F\u01F7\x03\x02\x02\x02\u020F\u0203\x03\x02\x02\x02\u0210\x9B" +
+		"\x03\x02\x02\x02\u0211\u0215\x071\x02\x02\u0212\u0213\x07^\x02\x02\u0213" +
+		"\u0216\n\x10\x02\x02\u0214\u0216\n\x11\x02\x02\u0215\u0212\x03\x02\x02" +
+		"\x02\u0215\u0214\x03\x02\x02\x02\u0216\u0217\x03\x02\x02\x02\u0217\u0218" +
+		"\x03\x02\x02\x02\u0217\u0215\x03\x02\x02\x02\u0218\u0219\x03\x02\x02\x02" +
+		"\u0219\u021D\x071\x02\x02\u021A\u021C\t\x12\x02\x02\u021B\u021A\x03\x02" +
+		"\x02\x02\u021C\u021F\x03\x02\x02\x02\u021D\u021B\x03\x02\x02\x02\u021D" +
+		"\u021E\x03\x02\x02\x02\u021E\u0220\x03\x02\x02\x02\u021F\u021D\x03\x02" +
+		"\x02\x02\u0220\u0221\x06N\x03\x02\u0221\x9D\x03\x02\x02\x02\u0222\u0223" +
+		"\x07v\x02\x02\u0223\u0224\x07t\x02\x02\u0224\u0225\x07w\x02\x02\u0225" +
+		"\u0226\x07g\x02\x02\u0226\x9F\x03\x02\x02\x02\u0227\u0228\x07h\x02\x02" +
+		"\u0228\u0229\x07c\x02\x02\u0229\u022A\x07n\x02\x02\u022A\u022B\x07u\x02" +
+		"\x02\u022B\u022C\x07g\x02\x02\u022C\xA1\x03\x02\x02\x02\u022D\u022E\x07" +
+		"p\x02\x02\u022E\u022F\x07w\x02\x02\u022F\u0230\x07n\x02\x02\u0230\u0231" +
+		"\x07n\x02\x02\u0231\xA3\x03\x02\x02\x02\u0232\u0233\x07d\x02\x02\u0233" +
+		"\u0234\x07q\x02\x02\u0234\u0235\x07q\x02\x02\u0235\u0236\x07n\x02\x02" +
+		"\u0236\u0237\x07g\x02\x02\u0237\u0238\x07c\x02\x02\u0238\u0259\x07p\x02" +
+		"\x02\u0239\u023A\x07d\x02\x02\u023A\u023B\x07{\x02\x02\u023B\u023C\x07" +
+		"v\x02\x02\u023C\u0259\x07g\x02\x02\u023D\u023E\x07u\x02\x02\u023E\u023F" +
+		"\x07j\x02\x02\u023F\u0240\x07q\x02\x02\u0240\u0241\x07t\x02\x02\u0241" +
+		"\u0259\x07v\x02\x02\u0242\u0243\x07e\x02\x02\u0243\u0244\x07j\x02\x02" +
+		"\u0244\u0245\x07c\x02\x02\u0245\u0259\x07t\x02\x02\u0246\u0247\x07k\x02" +
+		"\x02\u0247\u0248\x07p\x02\x02\u0248\u0259\x07v\x02\x02\u0249\u024A\x07" +
+		"n\x02\x02\u024A\u024B\x07q\x02\x02\u024B\u024C\x07p\x02\x02\u024C\u0259" +
+		"\x07i\x02\x02\u024D\u024E\x07h\x02\x02\u024E\u024F\x07n\x02\x02\u024F" +
+		"\u0250\x07q\x02\x02\u0250\u0251\x07c\x02\x02\u0251\u0259\x07v\x02\x02" +
+		"\u0252\u0253\x07f\x02\x02\u0253\u0254\x07q\x02\x02\u0254\u0255\x07w\x02" +
+		"\x02\u0255\u0256\x07d\x02\x02\u0256\u0257\x07n\x02\x02\u0257\u0259\x07" +
+		"g\x02\x02\u0258\u0232\x03\x02\x02\x02\u0258\u0239\x03\x02\x02\x02\u0258" +
+		"\u023D\x03\x02\x02\x02\u0258\u0242\x03\x02\x02\x02\u0258\u0246\x03\x02" +
+		"\x02\x02\u0258\u0249\x03\x02\x02\x02\u0258\u024D\x03\x02\x02\x02\u0258" +
+		"\u0252\x03\x02\x02\x02\u0259\xA5\x03\x02\x02\x02\u025A\u025B\x07f\x02" +
+		"\x02\u025B\u025C\x07g\x02\x02\u025C\u025D\x07h\x02\x02\u025D\xA7\x03\x02" +
+		"\x02\x02\u025E\u0262\t\x13\x02\x02\u025F\u0261\t\x14\x02\x02\u0260\u025F" +
+		"\x03\x02\x02\x02\u0261\u0264\x03\x02\x02\x02\u0262\u0260\x03\x02\x02\x02" +
+		"\u0262\u0263\x03\x02\x02\x02\u0263\xA9\x03\x02\x02\x02\u0264\u0262\x03" +
+		"\x02\x02\x02\u0265\u026E\x072\x02\x02\u0266\u026A\t\b\x02\x02\u0267\u0269" +
+		"\t\t\x02\x02\u0268\u0267\x03\x02\x02\x02\u0269\u026C\x03\x02\x02\x02\u026A" +
+		"\u0268\x03\x02\x02\x02\u026A\u026B\x03\x02\x02\x02\u026B\u026E\x03\x02" +
+		"\x02\x02\u026C\u026A\x03\x02\x02\x02\u026D\u0265\x03\x02\x02\x02\u026D" +
+		"\u0266\x03\x02\x02\x02\u026E\u026F\x03\x02\x02\x02\u026F\u0270\bU\x04" +
+		"\x02\u0270\xAB\x03\x02\x02\x02\u0271\u0275\t\x13\x02\x02\u0272\u0274\t" +
+		"\x14\x02\x02\u0273\u0272\x03\x02\x02\x02\u0274\u0277\x03\x02\x02\x02\u0275" +
+		"\u0273\x03\x02\x02\x02\u0275\u0276\x03\x02\x02\x02\u0276\u0278\x03\x02" +
+		"\x02\x02\u0277\u0275\x03\x02\x02\x02\u0278\u0279\bV\x04\x02\u0279\xAD" +
+		"\x03\x02\x02\x02$\x02\x03\xB1\xBB\xC5\xCA\u01BB\u01BE\u01C5\u01C8\u01CF" +
+		"\u01D2\u01D5\u01DC\u01DF\u01E5\u01E7\u01EB\u01F0\u01F2\u01F5\u01FD\u01FF" +
+		"\u0209\u020B\u020F\u0215\u0217\u021D\u0258\u0262\u026A\u026D\u0275\x05" +
+		"\b\x02\x02\x04\x03\x02\x04\x02\x02";
+	public static readonly _serializedATN: string = Utils.join(
+		[
+			painless_lexer._serializedATNSegment0,
+			painless_lexer._serializedATNSegment1,
+		],
+		"",
+	);
+	public static __ATN: ATN;
+	public static get _ATN(): ATN {
+		if (!painless_lexer.__ATN) {
+			painless_lexer.__ATN = new ATNDeserializer().deserialize(Utils.toCharArray(painless_lexer._serializedATN));
+		}
+
+		return painless_lexer.__ATN;
+	}
+
+}
+
--- a/packages/kbn-monaco/src/painless/antlr/painless_parser.g4
+++ b/packages/kbn-monaco/src/painless/antlr/painless_parser.g4
@ -0,0 +1,226 @@
+parser grammar painless_parser;
+
+options { tokenVocab=painless_lexer; }
+
+source
+    : function* statement* EOF
+    ;
+
+function
+    : decltype ID parameters block
+    ;
+
+parameters
+    : LP ( decltype ID ( COMMA decltype ID )* )? RP
+    ;
+
+statement
+    : rstatement
+    | dstatement ( SEMICOLON | EOF )
+    ;
+
+// Note we use a predicate on the if/else case here to prevent the
+// "dangling-else" ambiguity by forcing the 'else' token to be consumed
+// as soon as one is found.  See (https://en.wikipedia.org/wiki/Dangling_else).
+rstatement
+    : IF LP expression RP trailer ( ELSE trailer | { this._input.LA(1) != painless_parser.ELSE }? )                 # if
+    | WHILE LP expression RP ( trailer | empty )                                               # while
+    | FOR LP initializer? SEMICOLON expression? SEMICOLON afterthought? RP ( trailer | empty ) # for
+    | FOR LP decltype ID COLON expression RP trailer                                           # each
+    | FOR LP ID IN expression RP trailer                                                       # ineach
+    | TRY block trap+                                                                          # try
+    ;
+
+dstatement
+    : DO block WHILE LP expression RP # do
+    | declaration                     # decl
+    | CONTINUE                        # continue
+    | BREAK                           # break
+    | RETURN expression?              # return
+    | THROW expression                # throw
+    | expression                      # expr
+    ;
+
+trailer
+    : block
+    | statement
+    ;
+
+block
+    : LBRACK statement* dstatement? RBRACK
+    ;
+
+empty
+    : SEMICOLON
+    ;
+
+initializer
+    : declaration
+    | expression
+    ;
+
+afterthought
+    : expression
+    ;
+
+declaration
+    : decltype declvar (COMMA declvar)*
+    ;
+
+decltype
+    : type (LBRACE RBRACE)*
+    ;
+
+type
+    : DEF
+    | PRIMITIVE
+    | ID (DOT DOTID)*
+    ;
+
+declvar
+    : ID ( ASSIGN expression )?
+    ;
+
+trap
+    : CATCH LP type ID RP block
+    ;
+
+noncondexpression
+    :               unary                                                       # single
+    |               noncondexpression ( MUL | DIV | REM ) noncondexpression     # binary
+    |               noncondexpression ( ADD | SUB ) noncondexpression           # binary
+    |               noncondexpression ( FIND | MATCH ) noncondexpression        # binary
+    |               noncondexpression ( LSH | RSH | USH ) noncondexpression     # binary
+    |               noncondexpression ( LT | LTE | GT | GTE ) noncondexpression # comp
+    |               noncondexpression INSTANCEOF decltype                       # instanceof
+    |               noncondexpression ( EQ | EQR | NE | NER ) noncondexpression # comp
+    |               noncondexpression BWAND noncondexpression                   # binary
+    |               noncondexpression XOR noncondexpression                     # binary
+    |               noncondexpression BWOR noncondexpression                    # binary
+    |               noncondexpression BOOLAND noncondexpression                 # bool
+    |               noncondexpression BOOLOR noncondexpression                  # bool
+    | <assoc=right> noncondexpression ELVIS noncondexpression                   # elvis
+    ;
+
+expression
+    :               noncondexpression                                            # nonconditional
+    | <assoc=right> noncondexpression COND expression COLON expression           # conditional
+    | <assoc=right> noncondexpression ( ASSIGN | AADD | ASUB | AMUL |
+                                        ADIV   | AREM | AAND | AXOR |
+                                        AOR    | ALSH | ARSH | AUSH ) expression # assignment
+    ;
+
+unary
+    : ( INCR | DECR ) chain # pre
+    | ( ADD | SUB ) unary   # addsub
+    | unarynotaddsub        # notaddsub
+    ;
+
+unarynotaddsub
+    : chain                     # read
+    | chain (INCR | DECR )      # post
+    | ( BOOLNOT | BWNOT ) unary # not
+    | castexpression            # cast
+    ;
+
+castexpression
+    : LP primordefcasttype RP unary    # primordefcast
+    | LP refcasttype RP unarynotaddsub # refcast
+    ;
+
+primordefcasttype
+    : DEF
+    | PRIMITIVE
+    ;
+
+refcasttype
+    : DEF (LBRACE RBRACE)+
+    | PRIMITIVE (LBRACE RBRACE)+
+    | ID (DOT DOTID)* (LBRACE RBRACE)*
+    ;
+
+chain
+    : primary postfix* # dynamic
+    | arrayinitializer # newarray
+    ;
+
+primary
+    : LP expression RP                    # precedence
+    | ( OCTAL | HEX | INTEGER | DECIMAL ) # numeric
+    | TRUE                                # true
+    | FALSE                               # false
+    | NULL                                # null
+    | STRING                              # string
+    | REGEX                               # regex
+    | listinitializer                     # listinit
+    | mapinitializer                      # mapinit
+    | ID                                  # variable
+    | ID arguments                        # calllocal
+    | NEW type arguments                  # newobject
+    ;
+
+postfix
+    : callinvoke
+    | fieldaccess
+    | braceaccess
+    ;
+
+postdot
+    : callinvoke
+    | fieldaccess
+    ;
+
+callinvoke
+    : ( DOT | NSDOT ) DOTID arguments
+    ;
+
+fieldaccess
+    : ( DOT | NSDOT ) ( DOTID | DOTINTEGER )
+    ;
+
+braceaccess
+    : LBRACE expression RBRACE
+    ;
+
+arrayinitializer
+    : NEW type ( LBRACE expression RBRACE )+ ( postdot postfix* )?                        # newstandardarray
+    | NEW type LBRACE RBRACE LBRACK ( expression ( COMMA expression )* )? RBRACK postfix* # newinitializedarray
+    ;
+
+listinitializer
+    : LBRACE expression ( COMMA expression)* RBRACE
+    | LBRACE RBRACE
+    ;
+
+mapinitializer
+    : LBRACE maptoken ( COMMA maptoken )* RBRACE
+    | LBRACE COLON RBRACE
+    ;
+
+maptoken
+    : expression COLON expression
+    ;
+
+arguments
+    : ( LP ( argument ( COMMA argument )* )? RP )
+    ;
+
+argument
+    : expression
+    | lambda
+    | funcref
+    ;
+
+lambda
+    : ( lamtype | LP ( lamtype ( COMMA lamtype )* )? RP ) ARROW ( block | expression )
+    ;
+
+lamtype
+    : decltype? ID
+    ;
+
+funcref
+    : decltype REF ID  # classfuncref
+    | decltype REF NEW # constructorfuncref
+    | THIS REF ID      # localfuncref
+    ;
--- a/packages/kbn-monaco/src/painless/antlr/painless_parser.interp
+++ b/packages/kbn-monaco/src/painless/antlr/painless_parser.interp
--- a/packages/kbn-monaco/src/painless/antlr/painless_parser.tokens
+++ b/packages/kbn-monaco/src/painless/antlr/painless_parser.tokens
@ -0,0 +1,158 @@
+WS=1
+COMMENT=2
+LBRACK=3
+RBRACK=4
+LBRACE=5
+RBRACE=6
+LP=7
+RP=8
+DOT=9
+NSDOT=10
+COMMA=11
+SEMICOLON=12
+IF=13
+IN=14
+ELSE=15
+WHILE=16
+DO=17
+FOR=18
+CONTINUE=19
+BREAK=20
+RETURN=21
+NEW=22
+TRY=23
+CATCH=24
+THROW=25
+THIS=26
+INSTANCEOF=27
+BOOLNOT=28
+BWNOT=29
+MUL=30
+DIV=31
+REM=32
+ADD=33
+SUB=34
+LSH=35
+RSH=36
+USH=37
+LT=38
+LTE=39
+GT=40
+GTE=41
+EQ=42
+EQR=43
+NE=44
+NER=45
+BWAND=46
+XOR=47
+BWOR=48
+BOOLAND=49
+BOOLOR=50
+COND=51
+COLON=52
+ELVIS=53
+REF=54
+ARROW=55
+FIND=56
+MATCH=57
+INCR=58
+DECR=59
+ASSIGN=60
+AADD=61
+ASUB=62
+AMUL=63
+ADIV=64
+AREM=65
+AAND=66
+AXOR=67
+AOR=68
+ALSH=69
+ARSH=70
+AUSH=71
+OCTAL=72
+HEX=73
+INTEGER=74
+DECIMAL=75
+STRING=76
+REGEX=77
+TRUE=78
+FALSE=79
+NULL=80
+PRIMITIVE=81
+DEF=82
+ID=83
+DOTINTEGER=84
+DOTID=85
+'{'=3
+'}'=4
+'['=5
+']'=6
+'('=7
+')'=8
+'.'=9
+'?.'=10
+','=11
+';'=12
+'if'=13
+'in'=14
+'else'=15
+'while'=16
+'do'=17
+'for'=18
+'continue'=19
+'break'=20
+'return'=21
+'new'=22
+'try'=23
+'catch'=24
+'throw'=25
+'this'=26
+'instanceof'=27
+'!'=28
+'~'=29
+'*'=30
+'/'=31
+'%'=32
+'+'=33
+'-'=34
+'<<'=35
+'>>'=36
+'>>>'=37
+'<'=38
+'<='=39
+'>'=40
+'>='=41
+'=='=42
+'==='=43
+'!='=44
+'!=='=45
+'&'=46
+'^'=47
+'|'=48
+'&&'=49
+'||'=50
+'?'=51
+':'=52
+'?:'=53
+'::'=54
+'->'=55
+'=~'=56
+'==~'=57
+'++'=58
+'--'=59
+'='=60
+'+='=61
+'-='=62
+'*='=63
+'/='=64
+'%='=65
+'&='=66
+'^='=67
+'|='=68
+'<<='=69
+'>>='=70
+'>>>='=71
+'true'=78
+'false'=79
+'null'=80
+'def'=82
--- a/packages/kbn-monaco/src/painless/antlr/painless_parser.ts
+++ b/packages/kbn-monaco/src/painless/antlr/painless_parser.ts
--- a/packages/kbn-monaco/src/painless/antlr/painless_parser_listener.ts
+++ b/packages/kbn-monaco/src/painless/antlr/painless_parser_listener.ts
--- a/packages/kbn-monaco/src/painless/completion_adapter.ts
+++ b/packages/kbn-monaco/src/painless/completion_adapter.ts
@ -18,7 +18,7 @@
 */

 import { monaco } from '../monaco_imports';
-import { EditorStateService } from './services';
+import { EditorStateService } from './lib';
 import { PainlessCompletionResult, PainlessCompletionKind } from './types';
 import { PainlessWorker } from './worker';

--- a/packages/kbn-monaco/src/painless/diagnostics_adapter.ts
+++ b/packages/kbn-monaco/src/painless/diagnostics_adapter.ts
@ -0,0 +1,56 @@
+/*
+ * Licensed to Elasticsearch B.V. under one or more contributor
+ * license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright
+ * ownership. Elasticsearch B.V. licenses this file to you under
+ * the Apache License, Version 2.0 (the "License"); you may
+ * not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+import { monaco } from '../monaco_imports';
+import { ID } from './constants';
+import { WorkerAccessor } from './language';
+import { PainlessError } from './worker';
+
+const toDiagnostics = (error: PainlessError): monaco.editor.IMarkerData => {
+  return {
+    ...error,
+    severity: monaco.MarkerSeverity.Error,
+  };
+};
+
+export class DiagnosticsAdapter {
+  constructor(private worker: WorkerAccessor) {
+    const onModelAdd = (model: monaco.editor.IModel): void => {
+      let handle: any;
+      model.onDidChangeContent(() => {
+        // Every time a new change is made, wait 500ms before validating
+        clearTimeout(handle);
+        handle = setTimeout(() => this.validate(model.uri), 500);
+      });
+
+      this.validate(model.uri);
+    };
+    monaco.editor.onDidCreateModel(onModelAdd);
+    monaco.editor.getModels().forEach(onModelAdd);
+  }
+
+  private async validate(resource: monaco.Uri): Promise<void> {
+    const worker = await this.worker(resource);
+    const errorMarkers = await worker.getSyntaxErrors();
+
+    const model = monaco.editor.getModel(resource);
+
+    // Set the error markers and underline them with "Error" severity
+    monaco.editor.setModelMarkers(model!, ID, errorMarkers.map(toDiagnostics));
+  }
+}
--- a/packages/kbn-monaco/src/painless/language.ts
+++ b/packages/kbn-monaco/src/painless/language.ts
@ -19,25 +19,22 @@

 import { monaco } from '../monaco_imports';

-import { WorkerProxyService, EditorStateService } from './services';
+import { WorkerProxyService, EditorStateService } from './lib';
 import { ID } from './constants';
 import { PainlessContext, PainlessAutocompleteField } from './types';
 import { PainlessWorker } from './worker';
 import { PainlessCompletionAdapter } from './completion_adapter';
+import { DiagnosticsAdapter } from './diagnostics_adapter';

 const workerProxyService = new WorkerProxyService();
 const editorStateService = new EditorStateService();

-type WorkerAccessor = (...uris: monaco.Uri[]) => Promise<PainlessWorker>;
+export type WorkerAccessor = (...uris: monaco.Uri[]) => Promise<PainlessWorker>;

 const worker: WorkerAccessor = (...uris: monaco.Uri[]): Promise<PainlessWorker> => {
  return workerProxyService.getWorker(uris);
 };

-monaco.languages.onLanguage(ID, async () => {
-  workerProxyService.setup();
-});
-
 export const getSuggestionProvider = (
  context: PainlessContext,
  fields?: PainlessAutocompleteField[]
@ -46,3 +43,9 @@ export const getSuggestionProvider = (

  return new PainlessCompletionAdapter(worker, editorStateService);
 };
+
+monaco.languages.onLanguage(ID, async () => {
+  workerProxyService.setup();
+
+  new DiagnosticsAdapter(worker);
+});
--- a/packages/kbn-monaco/src/painless/services/editor_state.ts
+++ b/packages/kbn-monaco/src/painless/services/editor_state.ts
--- a/packages/kbn-monaco/src/painless/services/index.ts
+++ b/packages/kbn-monaco/src/painless/services/index.ts
--- a/packages/kbn-monaco/src/painless/services/worker_proxy.ts
+++ b/packages/kbn-monaco/src/painless/services/worker_proxy.ts
--- a/packages/kbn-monaco/src/painless/worker/index.ts
+++ b/packages/kbn-monaco/src/painless/worker/index.ts
@ -18,3 +18,5 @@
 */

 export { PainlessWorker } from './painless_worker';
+
+export { PainlessError } from './lib';
--- a/packages/kbn-monaco/src/painless/worker/lib/error_listener.ts
+++ b/packages/kbn-monaco/src/painless/worker/lib/error_listener.ts
@ -0,0 +1,59 @@
+/*
+ * Licensed to Elasticsearch B.V. under one or more contributor
+ * license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright
+ * ownership. Elasticsearch B.V. licenses this file to you under
+ * the Apache License, Version 2.0 (the "License"); you may
+ * not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+import { ANTLRErrorListener, RecognitionException, Recognizer } from 'antlr4ts';
+
+export interface PainlessError {
+  startLineNumber: number;
+  startColumn: number;
+  endLineNumber: number;
+  endColumn: number;
+  message: string;
+}
+
+export class PainlessErrorListener implements ANTLRErrorListener<any> {
+  private errors: PainlessError[] = [];
+
+  syntaxError(
+    recognizer: Recognizer<any, any>,
+    offendingSymbol: any,
+    line: number,
+    column: number,
+    message: string,
+    e: RecognitionException | undefined
+  ): void {
+    let endColumn = column + 1;
+
+    if (offendingSymbol?._text) {
+      endColumn = column + offendingSymbol._text.length;
+    }
+
+    this.errors.push({
+      startLineNumber: line,
+      endLineNumber: line,
+      startColumn: column,
+      endColumn,
+      message,
+    });
+  }
+
+  getErrors(): PainlessError[] {
+    return this.errors;
+  }
+}
--- a/packages/kbn-monaco/src/painless/worker/lib/index.ts
+++ b/packages/kbn-monaco/src/painless/worker/lib/index.ts
@ -18,3 +18,7 @@
 */

 export { getAutocompleteSuggestions } from './autocomplete';
+
+export { PainlessError } from './error_listener';
+
+export { parseAndGetSyntaxErrors } from './parser';
--- a/packages/kbn-monaco/src/painless/worker/lib/lexer.ts
+++ b/packages/kbn-monaco/src/painless/worker/lib/lexer.ts
@ -0,0 +1,56 @@
+/*
+ * Licensed to Elasticsearch B.V. under one or more contributor
+ * license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright
+ * ownership. Elasticsearch B.V. licenses this file to you under
+ * the Apache License, Version 2.0 (the "License"); you may
+ * not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+import { CharStream } from 'antlr4ts';
+import { painless_lexer as PainlessLexer } from '../../antlr/painless_lexer';
+
+/*
+ * This extends the PainlessLexer class in order to handle backslashes appropriately
+ * It is being invoked in painless_lexer.g4
+ * Based on the Java implementation: https://github.com/elastic/elasticsearch/blob/feab123ba400b150f3dcd04dd27cf57474b70d5a/modules/lang-painless/src/main/java/org/elasticsearch/painless/antlr/EnhancedPainlessLexer.java#L73
+ */
+export class PainlessLexerEnhanced extends PainlessLexer {
+  constructor(input: CharStream) {
+    super(input);
+  }
+
+  isSlashRegex(): boolean {
+    const lastToken = super.nextToken();
+
+    if (lastToken == null) {
+      return true;
+    }
+
+    // @ts-ignore
+    switch (lastToken._type) {
+      case PainlessLexer.RBRACE:
+      case PainlessLexer.RP:
+      case PainlessLexer.OCTAL:
+      case PainlessLexer.HEX:
+      case PainlessLexer.INTEGER:
+      case PainlessLexer.DECIMAL:
+      case PainlessLexer.ID:
+      case PainlessLexer.DOTINTEGER:
+      case PainlessLexer.DOTID:
+        return false;
+      default:
+        return true;
+    }
+  }
+}
--- a/packages/kbn-monaco/src/painless/worker/lib/parser.ts
+++ b/packages/kbn-monaco/src/painless/worker/lib/parser.ts
@ -0,0 +1,54 @@
+/*
+ * Licensed to Elasticsearch B.V. under one or more contributor
+ * license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright
+ * ownership. Elasticsearch B.V. licenses this file to you under
+ * the Apache License, Version 2.0 (the "License"); you may
+ * not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+import { CommonTokenStream, CharStreams } from 'antlr4ts';
+import { painless_parser as PainlessParser, SourceContext } from '../../antlr/painless_parser';
+import { PainlessError, PainlessErrorListener } from './error_listener';
+import { PainlessLexerEnhanced } from './lexer';
+
+const parse = (
+  code: string
+): {
+  source: SourceContext;
+  errors: PainlessError[];
+} => {
+  const inputStream = CharStreams.fromString(code);
+  const lexer = new PainlessLexerEnhanced(inputStream);
+  const painlessLangErrorListener = new PainlessErrorListener();
+  const tokenStream = new CommonTokenStream(lexer);
+  const parser = new PainlessParser(tokenStream);
+
+  lexer.removeErrorListeners();
+  parser.removeErrorListeners();
+
+  lexer.addErrorListener(painlessLangErrorListener);
+  parser.addErrorListener(painlessLangErrorListener);
+
+  const errors: PainlessError[] = painlessLangErrorListener.getErrors();
+
+  return {
+    source: parser.source(),
+    errors,
+  };
+};
+
+export const parseAndGetSyntaxErrors = (code: string): PainlessError[] => {
+  const { errors } = parse(code);
+  return errors;
+};
--- a/packages/kbn-monaco/src/painless/worker/painless.worker.ts
+++ b/packages/kbn-monaco/src/painless/worker/painless.worker.ts
@ -23,10 +23,11 @@
 import 'regenerator-runtime/runtime';
 // @ts-ignore
 import * as worker from 'monaco-editor/esm/vs/editor/editor.worker';
+import { monaco } from '../../monaco_imports';
 import { PainlessWorker } from './painless_worker';

 self.onmessage = () => {
-  worker.initialize((ctx: any, createData: any) => {
-    return new PainlessWorker();
+  worker.initialize((ctx: monaco.worker.IWorkerContext, createData: any) => {
+    return new PainlessWorker(ctx);
  });
 };
--- a/packages/kbn-monaco/src/painless/worker/painless_worker.ts
+++ b/packages/kbn-monaco/src/painless/worker/painless_worker.ts
@ -17,11 +17,27 @@
 * under the License.
 */

+import { monaco } from '../../monaco_imports';
 import { PainlessCompletionResult, PainlessContext, PainlessAutocompleteField } from '../types';

-import { getAutocompleteSuggestions } from './lib';
-
+import { getAutocompleteSuggestions, parseAndGetSyntaxErrors } from './lib';
 export class PainlessWorker {
+  private _ctx: monaco.worker.IWorkerContext;
+
+  constructor(ctx: monaco.worker.IWorkerContext) {
+    this._ctx = ctx;
+  }
+
+  private getTextDocument(): string {
+    const model = this._ctx.getMirrorModels()[0];
+    return model.getValue();
+  }
+
+  public async getSyntaxErrors() {
+    const code = this.getTextDocument();
+    return parseAndGetSyntaxErrors(code);
+  }
+
  public provideAutocompleteSuggestions(
    currentLineChars: string,
    context: PainlessContext,
--- a/yarn.lock
+++ b/yarn.lock
@ -6918,6 +6918,16 @@ ansicolors@~0.3.2:
  resolved "https://registry.yarnpkg.com/ansicolors/-/ansicolors-0.3.2.tgz#665597de86a9ffe3aa9bfbe6cae5c6ea426b4979"
  integrity sha1-ZlWX3oap/+Oqm/vmyuXG6kJrSXk=

+antlr4ts-cli@^0.5.0-alpha.3:
+  version "0.5.0-alpha.3"
+  resolved "https://registry.yarnpkg.com/antlr4ts-cli/-/antlr4ts-cli-0.5.0-alpha.3.tgz#1f581b2a3c840d3921a2f3b1e739e48c7e7c18cd"
+  integrity sha512-i6oyxfaXU6qnw4HgyeSIsOLlsvT7zU3vmenoJKFNVFP1QNodtJMZYpnyxc8TmOFpJs7fEoWanLavSSDEmcCZBQ==
+
+antlr4ts@^0.5.0-alpha.3:
+  version "0.5.0-alpha.3"
+  resolved "https://registry.yarnpkg.com/antlr4ts/-/antlr4ts-0.5.0-alpha.3.tgz#fa6d39d88d6b96341a8afef45867af9abcb38766"
+  integrity sha512-La89tKkGcHFIVuruv4Bm1esc3zLmES2NOTEwwNS1pudz+zx/0FNqQeUu9p48i9/QHKPVqjN87LB+q3buTg7oDQ==
+
 any-base@^1.1.0:
  version "1.1.0"
  resolved "https://registry.yarnpkg.com/any-base/-/any-base-1.1.0.tgz#ae101a62bc08a597b4c9ab5b7089d456630549fe"